A code name for the drug ecstasy used when trying to talk about it in front of parents or straight folks, see also, rolls, tabs, ex, pills, and many others. Rasfay is a word that was made up while under the influence of ecstasy and is lesser known to people.

Yo man can you get me some Rasfay?

Hey you wanna rasfay this weekend? I got some awesome pills that will blow your mind.